# Indentable rlcompleter
#
# Extend standard rlcompleter module to let tab key can indent
# and also completing valid Python identifiers and keywords.

import os.path, atexit

try:
    import readline
except ImportError:
    pass
else:
    import rlcompleter

    class irlcompleter(rlcompleter.Completer):
        def complete(self, text, state):
            if text == "":
                readline.insert_text('\t')
                return None
            else:
                return rlcompleter.Completer.complete(self,text,state)

    # You could change this line to bind another key instead tab.
    readline.parse_and_bind("tab: complete")
    readline.set_completer(irlcompleter().complete)

    # Restore our command-line history, and save it when Python exits.
    historyPath = os.path.expanduser("~/.pyhistory")
    try:
        readline.read_history_file(historyPath)
    except IOError:
        # presumably file-not-found
        pass
    atexit.register(lambda x=historyPath, y=readline: y.write_history_file(x))

# Delete the imports so we don't clutter the default namespace. However, if we
# delete rlcompleter, completion stops working.
del os
del atexit
del readline
del irlcompleter
del historyPath